package kr.hkit.powerjava.chapter24.work;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

public class StudentDAO implements InterfaceStudent<Student> {
	private static final String FILE = "stdlist.data";
	private ArrayList<Student> arList;
	
	
	public StudentDAO() {
		loadList();
	}

	@Override
	public void insertItem(Student item) {
		arList.add(item);
	}

	@Override
	public void deleteItem(Student item) {
		arList.remove(item);
	}

	@Override
	public void updateItem(Student item) {
		arList.set(arList.indexOf(item), item);
	}

	@Override
	public void prnItem() {
		for(Student std : arList){
			System.out.println(std);
		}
	}
	
	public void prnItem(ArrayList<Student> list) {
		for(Student std : arList){
			System.out.println(std);
		}
	}

	@Override
	public Student searchItem(Student item) {
		if (arList.contains(item)){
			return arList.get(arList.indexOf(item));
		}else{
			return null;
		}
	}

	@Override
	public void loadList() {
		ObjectInputStream ois = null;
		try {
			ois = new ObjectInputStream(new BufferedInputStream(new FileInputStream(StudentDAO.FILE)));
			arList = (ArrayList<Student>) ois.readObject();
		} catch (Exception e) {
			File file = new File(StudentDAO.FILE);
			try {
				file.createNewFile();
				arList = new ArrayList<>();
			} catch (IOException e1) {
				e1.printStackTrace();
			}
//			System.err.println(e);
		} finally {
			if (ois != null) try{ois.close();} catch(Exception e){}
		}
	}

	@Override
	public void saveList() {
		ObjectOutputStream oos = null;
		try {
			oos = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(StudentDAO.FILE)));
			oos.writeObject(arList);
			oos.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (oos != null) try{oos.close();} catch(Exception e){}
		}
		
	}
	
}
